Power supply device



FIG. 1 is a perspective view of a power supply device, showing my design;

FIG. 2 is a front view of the power supply device thereof;

FIG. 3 is a back view of the power supply device thereof;

FIG. 4 is a right side view of the power supply device thereof;

FIG. 5 is a left side view of the power supply device thereof;

FIG. 6 is a top view of the power supply device thereof; and,

FIG. 7 is a bottom view of the power supply device thereof.

The broken lines in the drawings show portions of the power supply device that form no part of the claimed design. 

CLAIM I claim the ornamental design for a power supply device, as shown and described. 